241 lines
6.5 KiB
C
241 lines
6.5 KiB
C
/* $NetBSD: amfs_nfsl.c,v 1.1.1.8 2005/04/23 18:09:19 christos Exp $ */
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/*
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* Copyright (c) 1997-2005 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Id: amfs_nfsl.c,v 1.22 2005/01/03 20:56:45 ezk Exp
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*
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*/
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/*
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* NFSL: Network file system with local existence check. If the local
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* path denoted by $rfs exists, it behaves as type:=link.
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*
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* Example:
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* pkg type:=nfsl;rhost:=jonny;rfs:=/n/johnny/src/pkg;fs:=${rfs}
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/* forward declarations */
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static char *amfs_nfsl_match(am_opts *fo);
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static int amfs_nfsl_init(mntfs *mf);
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static int amfs_nfsl_mount(am_node *mp, mntfs *mf);
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static int amfs_nfsl_umount(am_node *mp, mntfs *mf);
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static void amfs_nfsl_umounted(mntfs *mf);
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static fserver *amfs_nfsl_ffserver(mntfs *mf);
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/*
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* NFS-Link operations
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*/
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am_ops amfs_nfsl_ops =
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{
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"nfsl",
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amfs_nfsl_match,
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amfs_nfsl_init,
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amfs_nfsl_mount,
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amfs_nfsl_umount,
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amfs_error_lookup_child,
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amfs_error_mount_child,
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amfs_error_readdir,
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0, /* amfs_nfsl_readlink */
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0, /* amfs_nfsl_mounted */
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amfs_nfsl_umounted,
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amfs_nfsl_ffserver,
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0, /* amfs_nfsl_get_wchan */
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FS_MKMNT | FS_BACKGROUND | FS_AMQINFO, /* nfs_fs_flags */
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#ifdef HAVE_FS_AUTOFS
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AUTOFS_NFSL_FS_FLAGS,
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#endif /* HAVE_FS_AUTOFS */
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};
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/*
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* Check that f/s has all needed fields.
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* Returns: matched string if found, NULL otherwise.
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*/
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static char *
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amfs_nfsl_match(am_opts *fo)
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{
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char *cp;
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char *ho = fo->opt_rhost;
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char *retval;
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struct stat stb;
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if (fo->opt_sublink)
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cp = fo->opt_sublink;
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else
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cp = fo->opt_fs;
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if (!cp || !ho) {
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plog(XLOG_USER, "amfs_nfsl: host $fs and $rhost must be specified");
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return NULL;
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}
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/*
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* If this host is not the same as $rhost, or if link does not exist,
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* call nfs_ops.fs_match().
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* If link value exists (or same host), call amfs_link_ops.fs_match().
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*/
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if (!STRCEQ(ho, am_get_hostname())) {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" is not local host, using type:=nfs", ho);
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retval = nfs_ops.fs_match(fo);
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} else if (lstat(cp, &stb) < 0) {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" does not exist, using type:=nfs", cp);
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retval = nfs_ops.fs_match(fo);
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} else {
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plog(XLOG_INFO, "amfs_nfsl: \"%s\" exists, using type:=link", cp);
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retval = amfs_link_ops.fs_match(fo);
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}
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return retval;
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}
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/*
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* Initialize.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_init(mntfs *mf)
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{
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int ret = 0;
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if (mf->mf_flags & MFF_NFSLINK) {
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if (amfs_link_ops.fs_init)
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ret = amfs_link_ops.fs_init(mf);
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} else {
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if (nfs_ops.fs_init)
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ret = nfs_ops.fs_init(mf);
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}
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return ret;
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}
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/*
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* Mount vfs.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_mount(am_node *mp, mntfs *mf)
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{
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int ret = 0;
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if (mf->mf_flags & MFF_NFSLINK) {
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if (amfs_link_ops.mount_fs)
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ret = amfs_link_ops.mount_fs(mp, mf);
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} else {
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if (nfs_ops.mount_fs)
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ret = nfs_ops.mount_fs(mp, mf);
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}
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return ret;
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}
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/*
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* Unmount VFS.
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* Returns: 0 if OK, non-zero (errno) if failed.
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*/
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static int
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amfs_nfsl_umount(am_node *mp, mntfs *mf)
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{
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int ret = 0;
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if (mf->mf_flags & MFF_NFSLINK) {
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if (amfs_link_ops.umount_fs)
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ret = amfs_link_ops.umount_fs(mp, mf);
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} else {
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if (nfs_ops.umount_fs)
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ret = nfs_ops.umount_fs(mp, mf);
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}
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return ret;
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}
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/*
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* Async unmount callback function.
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* After the base umount() succeeds, we may want to take extra actions,
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* such as informing remote mount daemons that we've unmounted them.
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* See amfs_auto_umounted(), host_umounted(), nfs_umounted().
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*/
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static void
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amfs_nfsl_umounted(mntfs *mf)
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{
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if (mf->mf_flags & MFF_NFSLINK) {
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if (amfs_link_ops.umounted)
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amfs_link_ops.umounted(mf);
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} else {
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if (nfs_ops.umounted)
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nfs_ops.umounted(mf);
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}
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}
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/*
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* Find a file server.
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* Returns: fserver of found server, or NULL if not found.
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*/
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static fserver *
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amfs_nfsl_ffserver(mntfs *mf)
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{
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char *cp;
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char *ho = mf->mf_fo->opt_rhost;
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struct stat stb;
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if (mf->mf_fo->opt_sublink)
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cp = mf->mf_fo->opt_sublink;
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else
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cp = mf->mf_fo->opt_fs;
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/*
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* If this host is not the same as $rhost, or if link does not exist,
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* call amfs_link_ops.ffserver().
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* If link value exists (or same host), then call ops_nfs.ffserver().
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*/
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if (!STRCEQ(ho, am_get_hostname()) || lstat(cp, &stb) < 0) {
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return nfs_ops.ffserver(mf);
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} else {
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mf->mf_flags |= MFF_NFSLINK;
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/* remove the FS_MKMNT flag, we don't want amd touching the mountpoint */
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mf->mf_fsflags &= ~FS_MKMNT;
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return amfs_link_ops.ffserver(mf);
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}
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}
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